@article{oai:repository.dl.itc.u-tokyo.ac.jp:00039378,
 author = {Sekiguchi, Tsutomu and Suwa, Noriyuki},
 issue = {1},
 journal = {Journal of the Faculty of Science, the University of Tokyo. Sect. 1 A, Mathematics = 東京大学理学部紀要. 第1類A, 数学},
 month = {},
 note = {application/pdf},
 pages = {1--45},
 title = {Some cases of extensions of group schemes over a discrete valuation ring I},
 volume = {38},
 year = {1991}
}